Cylinder head



K. BASSLER CYLINDER HEAD June 27, 1933.

Filed Nov. 6, 1931 Inventor: Kuwt 1 mm Basslew,

His Att own e3.

Patented June 27, 1933 UNITED STATES PATENT OFFICE KURT BASSLEB, OF IBER-LIN-WESTEND, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK CYLINDER HEAD Application filed November 6, 1931, Serial No. 573,453, and in Germany December 9, 1930.

The presentinvention relates to cylinder heads or cylinder covers for internal combustion engines and finds special application 111 the case of cylinder heads for d-cycle internal combustion engines which require a number of passages and flanges foryalves and cooling water channels and which consequently have a rather complicated shape, although it is not limit-ed thereto necessarily.

The object of my invention is to provide an improved construction and arrangement of cylinder head whereby the same can be made reliably and economically in a simple manner, and for a consideration of what I believe to be novel and my invention, attention is directed to the following specification and the claim appencec thereto.

In the drawing, Fig. l is a sectional view of a cylinder head embodying my invention, the section being taken on line 11, Fig. 2, and Fig. 2 is a sectional view taken on line 2 2, Fig. 1.

Referring to the drawing, 3 indicates the body of the cylinder head which comprises the top plate a, the outer side wall 5, the intermediate walls 6 which define the cooling passages, the valve openings and also form strengthening ribs, and the bolting flanges 7. The body 3 is made preferably of cast steel and is formed in such a way that the several individual holes or passages, such as the passages for cooling water, open toward the inner or cylinder side of the casting, as is inclicatecl at 8. fhis arrangement is'advantageous in that it provides a construction wherein the internal spaces can be readily cleaned of the sand which forms in the cores of the mould. The openings are closed by means of an inner or bottom plate 9 which is made of a suitable metal and which is pressed in, shrunk in, or screwed into the cylinder cover body after which it is rigidly connected with the steel casting by means of fused metal, for example, by soldering or welding as is indicated at 10. The plate 9 is formed preferably of rolled, pressed, or forged metal, for instance boiler plate, which is capable of resisting the heat stresses occurring during operation. In case it is shrunk in position, this can be accomplished by means of the lower flange 7 of the body, or by means of a special shrink rin At the points where the openings for the valves break through the bottom plate 9, the plate is preferably pressed to the body of the cylinder cover by means of bushings 11 which are pressed in, shrunk in, or provided with threads, after which they are fixed in place by fused metal as by welding or soldering.

This arrangement serves to give a reliable sealed connection.

By the above described arrangement it will be seen that the parts of the head which carry the bolting flanges and which must be especially strong mechanically, are formed of a steel casting and due to the arrangement whereby the cored passages are open to the bottom of the cylinder, the walls may be cast without internal stresses. On the other hand, the part 9 of the cylinder head which is exposed directly to the interior of the cylinder and hence is subjected during operation to high temperatures is constructed of a metal which is capable of withstanding the temperatures met with. In this connection, it will be understood that the inner walls 6 are maintained comparatively cool by the cooling water during the operation of the engine.

By my invention, therefore, it is compara tively simple to produce a cylinder cover or head which is free of stresses and which is capable of withstanding the operating temperatures even though the cover may have a very complicated form as is the case, for instance, in four-stroke or four-cycle engines.

What I claim as new and desire to secure by Letters Patent of the United States is:

A cylinder cover for an internal combustion engine comprising a single integral steel casting open on the side facing the cylinder and having cast in walls forming water cooling passages and passages for the valve structures, a separate cover plate which is rigidly attached to the open side of the casting and is fixed thereto by fused metal for closingthe open side, said cover plate having openings in line with the valve passages, and sealing bushings fixed rigidly in said openings by fused metal for pressing the cover plate tightly against the steel casting.

In witness whereof, I have hereunto set my 

